疎 （ソ） sparse, distant (of a relationship), estranged, alienated

疎開 （ソカイ） dispersal, evacuation, removal, spreading out (troops), deployment

過疎 （カソ） underpopulation, low population density, depopulation

空疎 （クウソ） empty (e.g. argument), insubstantial, hollow, fruitless

疎い （うとい） distant (from someone), aloof, estranged, knowing little (of), ill-informed (about), ignorant (of), unfamiliar (with), unacquainted (with)

疎む （うとむ） to shun, to avoid, to ostracize, to neglect, to distance oneself from, to give the hard shoulder

疎ら （まばら） sparse, thin, scattered, straggling, sporadic